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(D)2022 Science Grade 9 > Electric Circuts > Flashcards

Electric Circuts Flashcards

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1
Q

When was electric current discovere dand by who

A

Early 1700s Luigi Galvani and kater Alessandra Volta

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2
Q

What types of energy is in a cell

A

Chemical energy

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3
Q

What is the chemical energy inside a cell comverted into

A

Electical energy

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4
Q

Why is a conductor needed

A

To carry the electric cuurent from the cell to the light bulb

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5
Q

What is a conductor

A

a material or object that permits an electric current to flow easily.

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6
Q

What is an insulator

A

any of various substances that block or retard the flow of electrical or thermal currents.

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7
Q

What does a voltmeter mesure

A

Potential dufference of the battery (ability to deliver energy) in volts (V)

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8
Q

What does an ammeter mesure

A

The lectric current that flows in Ampere (A)

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9
Q

Series circuits

A

A circuit in which light bulbs are connected ina circle

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10
Q

Do Series or Parralel circuts glow brughter

A

Parralel

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11
Q

Advantage of parralel lights

A

If one bulb fuses the other bulbs still glows

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12
Q

Disadvantage of serues ciructs

A

If one bulb blows , non of the other light bublbs will shine

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13
Q

Which way are ammeters connected (circut wise)

A

Series

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14
Q

Which way are voltmeters connected (circut wise)

A

Parallel

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15
Q

Charge

A

Electric charge us an excess or defuciency of electrons

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16
Q

What is the size of charge determined by

A

Number of electrons lost or gained by an object

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17
Q

What quantity is charge mesured in

A

‘Packages’ of electrons called coulomb (C)

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18
Q

What is needed to obtaun electruc current

A

Spurce if energy (cell)

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19
Q

What is the function of the cell

A

To supply energy fo the charges which then move through the conductors and cause an electric current.The cell is the driving force for the flow of electrins htough a conductor

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20
Q

How can you mesure the amount of emergy transferred by the cell

A

By mesuring the difference in electric potential on either side of the cell.This differenec in energy is called potential difference and is meausred in (V) with the help of a voltmeter

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21
Q

Formula for potential difference

A

Energy transfered
—————————
Charge

V=W/Q

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22
Q

Def of a battery

A

Different cells which are connected to eachother

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23
Q

The greater the potential difference the greater the amount of…

A

Energy transfered to the charges

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24
Q

How is a current caused

A

The flow of charges

25
Q

The amount of charge is measured in

A

Coulombs (C)

26
Q

electric current strength is a measure of ….

A

how quickly the charges are flowing

27
Q

How do we mesure Electric current strength

A

As a number of charges which flow past a point in a conductor in a certain time

28
Q

Formula current strength in Ampère

A

Charge in Coulombs
——————————
Time

OR

I=Q/T or Q=It

29
Q

The electric current in a metallic conductor is the result of…

A

The flow of electrons

30
Q

Conventional direction of current

A

Although electrons are the charge carriers and move from the negatuve terminal to the posituve terminal of the battery, the current flows in the positive direction, fro, the posituve terminal to the negatuve terminal
REMEMBER-electrons flow in the opposit direction

31
Q

What is electruc current meausred with

A

Ammeter

32
Q

What does an Ammeter mesure

A

The amount of charge which flows through the ammeter per second

33
Q

Direct current

A

The flow of electruc current in one direction

34
Q

Alternating current

A

The direction of current that changes continuously

35
Q

What is resistance

A

The force against the flow of electric current

36
Q

A good conductor has a… resistance

A

Low resistance

37
Q

A bad conductor has a… resistance

A

High resistance

38
Q

The resistance of a conductor is a mesure of …

A

how difficult it is for the charges to move through the conductor

39
Q

Resistance can be mesured with a…

A

Multimeter

40
Q

What are multimeters

A

Instruments that can measure durect current, alternating current, potential difference and resistance

41
Q

What unit in resistance mesured in

A

Ohm (Line bubble line)

42
Q

Who was the unit for resistance named after

A

German scientist named George Ohm

43
Q

What ar alloys

A

Mixtures of metals and have a high resistance

44
Q

What is Nichrome

A

A mixture of nickel and chrome and is an alloy which is generally used as a resistor

45
Q

What is the relationship between potential difference and current strength

A

Potential difference is directly proportional to the current strength

46
Q

What can resistance be defined as

A

The relationship between potential difference across the ends of a conductor to the current that flows through the conductor

47
Q

The resistance of a conductor can be determined by the

A

Gradient of the graph or by calculating the ratio V/I

48
Q

What influences the resistance of a conductor

A

Temperature

49
Q

Ohms law

A

The current through a conductor is directly proportional to the potential difference across the conductor at a constant temperature

50
Q

Resistance =

A

Voltage
————
Current

51
Q

What is a short circut

A

A commen error which occurs in circuts this happens when an extra path for the charges between 2 points in a circuit occurs

52
Q

If a thick copper wire is connected across a lightbulb the lectrice current will flow through …

A

The copper wire and not the light bulb this is due to the fact that the copper wire offers lower rististance.The decrease in resistance in the circut leads to an increase in current and can be dangerous for the other light bulb

53
Q

What do most houses have for when there are short circuts

A

Contact-breakers which trip the power if a short circut occurs

54
Q

What does a greater potential difference mean for current strength

A

A greater current strength

55
Q

Two light bulbs of two light bulbs offer a xxx resistance than one light bulb thus a higher resistance leads to a xxx current strength

A

Higher resistance that one light bulb

Leads to a weaker current strength

56
Q

An increase in resistance will result in a xxx of current strength

A

Decrease

57
Q

What deductions can we make on light bulbs (resistors) in series

A
  • the current strength in a series circut is the same throughout the curcuit
  • the potential difference is divided between resistors (V total=V1 + V2 + V3)
    -the total resistance is the sum of the separate resistors (R total=R1 + R2 +R3)
58
Q

What is the relationship between potential difference and current strength

A

Directly proportional

(D)2022 Science Grade 9 (9 decks)

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